Hello, Sometimes on our CI (never in production, never when running locally) we are getting the error: java.lang.AssertionError: null at org.hibernate.sql.results.graph.entity.internal.EntityInitializerImpl.resolveEntityInstance1(EntityInitializerImpl.java:1114) ~[hibernate-core-6.6.26.Final.jar…

Please try updating to 6.6.29.Final first and report back if the problem persists. Are you using bytecode enhancement? The assertion error is only thrown when assertions are enabled, which is the default when executing tests. That’s why you’re not seeing this in production. The assertion that fail…

I am also facing similar issue while I run test in our CI. error: ▶ StackTrace I am using version 6.6.27Final . I have also tried with version 6.6.29Final. Below is my entity Structure for your reference. @Entity @IgnoreNameAttribute @UseCache(fullCache = true) public class FooBar extends BaseClas…

Your problem has absolutely nothing to do with what was asked here. Please create a new topic if you have a question. Posting unrelated stuff to an existing topic is not helpful.

Thanks for reply! We have bumped the version to 6.6.29.Final and will observe the CI. But the problem still persists: 2025-09-29T10:18:25.0909470Z java.lang.AssertionError: null 2025-09-29T10:18:25.0911276Z at org.hibernate.sql.results.graph.entity.internal.EntityInitializerImpl.resolveEntityIns…

Before the error, are there other logs that show data fetching from JDBC succeeds? If you enable org.hibernate.orm.jdbc.extract logging, you will see the values that are read from a JDBC ResultSet in the logs. Knowing whether the first few rows of the problematic query are read might help underst…

I can get the logs of (org.hibernate.orm.jdbc.extract) but I do not have much idea how to read them. Also, is the graph building by hibernate safe for concurrent modifications while reading? What I am observign is that ssertion error is happeing on separate thread, where we iterate over all accoun…

While I cannot debug the problem properly as reproduction is very random and requires several runs, I was able to compile hibernate-core with some print statements. Here is what I get so far, when the error occurs: Other initializer class: org.hibernate.sql.results.graph.entity.internal.EntitySel…

Also, is the graph building by hibernate safe for concurrent modifications while reading? It should be, yes. When hibernate builds the graph it issues several queries. Could it be that assosciation appering in between those queries makes the assert assumption wrong? This might very well be. I…

Hey, it was a while but finally I have soem more time to get back to it. So we have remedied the problem by fetching the graph in repeatable_read isolation. This shows that indeed we are hitting some concurrency problems in Hibernate. Unfortunately I was unable to create a reproductible example, b…

java.lang.AssertionError: null in resolveEntityInstance1

Hibernate ORM

shivam_pansuriya September 23, 2025, 5:18pm 5

Ok, I have added problem as new topic: java.lang.AssertionError: in RepositoryMethodInvoker

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java.lang.AssertionError: null in resolveEntityInstance1

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